Malicious PDF — malware analysis report

Static analysis result for SHA-256 d78808e9c5e1f1a7…

MALICIOUS

PDF

80.4 KB Created: 2021-04-03 22:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9544a6f2243d8ad4595135c3b7a3c56 SHA-1: 8cd06ae5d3f5115fbdb13f48a27ffe473bda4321 SHA-256: d78808e9c5e1f1a79496fca990bfcb7c47b8f5b701be6c325c0b109d25cde9c7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded URI pointing to a suspicious domain, identified by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to educational materials. The presence of external URIs indicates an attempt to redirect the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://lozipotod.ru/award?keyword=cengage+physics+class+9+pdf
    • http://about-fb-support.com/35329058111gvp2q.pdf
    • http://voseboler.iblogger.org/22991229570.pdf
    • http://tricitysikhs.com/how_much_air_does_you_need_for_plasma_cutterj4non.pdf
    • http://ig-copyrightnoticehelp.com/fenepudusefuzijudiwmwbex.pdf
    • http://republvinb.fun/vocabulary_workshop_level_e_unit_4_answers_choosing_the_right_words4g7j.pdf
    • http://wofaguwere.iblogger.org/pojidaveg.pdf
    • http://ergors.space/fekurufoxarufujurobg6mmd.pdf
    • http://lejesuxesegofaf.22web.org/bullish_and_bearish_patterns.pdf
    • http://kifepivukog.iblogger.org/acrylic_resin_properties.pdf
    • http://buloshnaya.site/bemagetufivanamo9kbjv.pdf
    • http://nisisigewu.iblogger.org/sejorifevijudavo.pdf
    • http://parrrtner.xyz/bebert0y1c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://a6668164-4238-4e0d-addb-cc4c62f58fca.filesusr.com/ugd/2dfcca_1f43d90b759b48a4ba6ce555790c145e.pdf?index=true
    • https://4b4b92a8-4ac5-4030-97d5-af0917f8c077.filesusr.com/ugd/0251f0_0086f1be84434b338fdb92c3bf6cf432.pdf?index=true
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_0c5e71526a8d47138090151b3a2d8527.pdf?index=true
    • https://uploads.strikinglycdn.com/files/af364260-36a8-48ca-a24c-c294508cc2ac/rabbit_holes_in_the_yard.pdf
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_145406b29c994b478b0d5536853cf92c.pdf?index=true
    • http://mazogatu.epizy.com/nipizesamobotupovidev.pdf
    • https://uploads.strikinglycdn.com/files/bd86bf05-fc77-4b37-aa2a-efb493216b02/kilixizasemuteluloni.pdf
    • http://gejopap.rf.gd/avery_3x5_flash_card_template.pdf
    • http://luvoxijamubisur.rf.gd/26078781250.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9bd.bin
0321ad5e4f5efb81bf7b290b3f90135d23cb925ef6affe5e19bd23638197052c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BD 5200 bytes
font_01_sfnt_off0000eb68.bin
6b0490cac253f901dee7715530a730e72409db646c5c38f9cb927388b52ae58a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB68 10424 bytes
font_02_sfnt_off00010f43.bin
ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F43 16164 bytes
font_03_sfnt_off0001245c.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1245C 4324 bytes

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